66665244256666 has 16 divisors (see below), whose sum is σ = 110089394189280. Its totient is φ = 30024380231280.

The previous prime is 66665244256651. The next prime is 66665244256733.

66665244256666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66665244256595 and 66665244256604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13900173636 + ... + 13900178431.

It is an arithmetic number, because the mean of its divisors is an integer number (6880587136830).

Almost surely, 2^{66665244256666} is an apocalyptic number.

66665244256666 is a deficient number, since it is larger than the sum of its proper divisors (43424149932614).

66665244256666 is a wasteful number, since it uses less digits than its factorization.

66665244256666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27800352189.

The product of its digits is 2687385600, while the sum is 70.

The spelling of 66665244256666 in words is "sixty-six trillion, six hundred sixty-five billion, two hundred forty-four million, two hundred fifty-six thousand, six hundred sixty-six".